Also, a strange stdio bug appeared after a gnulib update and disappeared after another, several months later. Then it (or something similar) returned, after another, and then once again disappeared, after another. Throughout, my attempts at debugging were stymied by ignorance and sloth (the usual suspects). This is the primary reason this release is so long in coming. In any case, let's hope this is the last one before the actual 5.8 (fingers crossed)...